Multi-Axis Machining Center has highest accuracy available.

Press Release Summary:

Model HU50-5AX Trunnion Table 5-axis CNC machining center holds 0.00012 in. true position (ISO 230-2) through all linear axes and 0.001° on B and C rotary axes. It features 2-station automatic pallet changer and is FMS system-ready. Tilting trunnion table accommodates part diameters up to 27 in. and weights up to 1430 lbs. Spindles are available in 50 taper rated to 12,000 rpm and 15,000 rpm or in 40 taper rated to 20,000 rpm.

Original Press Release:

Mitsui Seiki to Demonstrate Highest Accuracy Trunnion Table 5-axis CNC Maching Center at IMTS 2002

(Franklin Lakes, NJ - June 2002) Mitsui Seiki USA plans to put its HU50-5AX Trunnion Table 5-axis machining center through its paces at IMTS 2002, booth A-8727. The horizontal CNC machine holds 0.00012 in. true position (ISO 230-2) through all linear axes, and 0.001 degree on B and C rotary axes - which, according to the company, are the highest accuracies in the industry.

The trunnion table machine configuration meets the demands for high speed contouring and high accuracy positioning applications on heavier weight parts. In many applications, the workpiece casting process step can be completely eliminated and a highly complex, prismatic part can be produced from a solid block in a wide variety of materials. It features a 2-station automatic pallet changer and is FMS system-ready.

The HU50-5AX is the smallest in Mitsui Seiki's tilting trunnion table range, accommodating part diameters up to 27 in. and weights up to 1430 lbs. Spindles are available in 50 taper with up to 12,000 rpm and 15,000 rpm, or in 40 taper with 20,000 rpm.

Like all of Mitsui's rigid and precise horizontal machining centers, the HU50-5X's geometric accuracy is tightly controlled. It features a high cast iron grade bed which is treated with a gas emulsion process for controlling material composition. Its linear ways are made of abrasive-resistant, through-hardened tool steels for toughness and strength without flaking, bending or cracking.

The way mounting surfaces, both linear and rotary, are hand scraped, achieving straightness under 2 arc seconds in all linear axes, which would be impossible to achieve on surfaces that are machined and ground. Ballscrews are measured with a dedicated gage to ensure accuracy and reduce wear and positional tolerance degradation. The ballscrew mounting pads are hand scraped, rather than machined, so they are more accurately aligned with the ways. The manufacturer uses roller-bearing guideways on its rotary axes for maximum rigidity and smooth motion.

Mitsui Seiki also builds its own spindles featuring a tough and hard spindle shaft material. The spindle nose drive keys are ground in, rather than milled and inserted, providing up to 40% more stiffness in the taper. The company has also developed a patented tool clamping system that uses one-quarter of the typical clamping forces, substantially lengthening bearing life and the mechanical components of the spindle.

For more information, visit IMTS 2002 booth A-8727, or contact Mitsui Seiki USA, Inc., (201) 337-1300, or on the web at

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